Live Revision

This utility module deals with the work-flow to keep an updated content version in a draft-mode. An administrator of content is only permissible to revert to specific version of a content.

Configuration:

Edit a content type=> In "publishing options" section check the box "Revert Original Node"
That's all, now whenever an existing content of that content type will be updated,it'll be in a draft-mode instead of direct publish of updated content.

Technically this utility is being depend on trigger module. Assigning a custom action(Action-to-revert-node) to trigger for after saving updated content- mode so when-ever a node is being updated then node will be revert back to original version.